re PR c/60156 (GCC doesn't warn about variadic main)

PR c/60156
	* c-common.c (check_main_parameter_types): Warn about variadic main.

	* c-c++-common/pr60156.c: New test.

From-SVN: r209787

gcc/c-family/ChangeLog

@@ -1,3 +1,8 @@
+2014-04-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c/60156
+	* c-common.c (check_main_parameter_types): Warn about variadic main.
+
 2014-04-24  Mike Stump  <mikestump@comcast.net>
 
 	* c.opt (Wshadow-ivar): Default to on.

gcc/c-family/c-common.c

@@ -2228,6 +2228,10 @@ check_main_parameter_types (tree decl)
   if (argct > 0 && (argct < 2 || argct > 3))
     pedwarn (input_location, OPT_Wmain,
 	     "%q+D takes only zero or two arguments", decl);
+
+  if (stdarg_p (TREE_TYPE (decl)))
+    pedwarn (input_location, OPT_Wmain,
+	     "%q+D declared as variadic function", decl);
 }
 
 /* vector_targets_convertible_p is used for vector pointer types.  The

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2014-04-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c/60156
+	* c-c++-common/pr60156.c: New test.
+
 2014-04-25  Richard Biener  <rguenther@suse.de>
 
 	PR ipa/60912

gcc/testsuite/c-c++-common/pr60156.c

@@ -0,0 +1,9 @@
+/* PR c/60156 */
+/* { dg-do compile } */
+/* { dg-options "-Wpedantic" } */
+
+int
+main (int argc, char *argv[], ...) /* { dg-warning "declared as variadic function" } */
+{
+  return 0;
+}